chatfield



T. W. CHATFIELD.

H0t-Air Furnace.

` No. 100,979. Pateted Mar. 22., 1870.

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Letters PatentN 100,979, lated March 22,1870.

EGT-AIR FURNACE.

The Schedule referred to in these Letters Patent and making part of the same.

I, THOMAS W.` GHATFIELmof the city of Utica andState of New York, have invented certain Improvements in the Hot-Air Furnace, of. which the following is a specification.

The purpose and intent of my invention is toincrease the radiating-surface of the portion of the furnace situated above the lire-pot, and to improve the form, as well as the mode of construction ofthe same.

Figure 1 of the annexed drawings exhibits a vertical external elevation of mykfurnace.

A is the ash-pit.

t, the tire-pot.

c d and e f areheat-radiators.

The ash-pit and fire-pot are substantially the same as others heretofore made.

The heat-radiators are new inv several respects. They are each east perfect in two pieces, with projecting funnels matchingveach other when put together, so as to form connecting-pipes without the use of special connecting-pipes or intermediate collars. The lower portion of the connecting -pipes thus formed have circular sand trenches castv upon their tops to receive the upper portion of the tubes, making only one joint to each pipe, thus being more solid and secure, and less liable to leakage than where an intervening pipe orlthimble is used.

The parts of the radiators c d and e f thus cast entire to match each other are shown in Figures 2, 3,

and 4.

Fig. 2 represents the under part of the radiator c d, with the doorway 'it cast upon it.

Fig. 3 represents the upper part of the same radiator', and has the short cylindrical tubes g cast upon its under side, to set within the trenches at the tops of the tubes a, (fig..2.) This part (tig. 3) has also cast upon its upper side the short tubes h, with circular trenches t' on their tops to receive the short tubes k on the under side of tig. 4, forming passages for the fire and smoke.

The latter figure represents the under part e of the"` radiator e f, and has cast upon it the short tubes `k, projecting from its under side to set into the circular sand trenches t' in the part below it, and also the double circular trenches l and m for the reception ofthe corresponding circular edges on the under side of the upper part f.

The two radiators described being thus connected by the connecting-tubes thus formed, the fire and smoke pass from one radiator to the other.

The form of the upper part f of the radiator e f is -clearly seen in fig. 1. The only short tubes used and cast upon it are shown at o p. These are for the reception of the complex tube r. This upper part f, like the other parts of the radiators, is ovalin its shape, with the double circular edges ou its under side corresponding to and fitting the circular trenches l and m on the under half of this radiator, and leaving a. free circular passage for the fire and smoke between the two parts.

There is also a smaller central radiator, q, standing upon a central funnel on the top of the radiator c d, as seen at s, and having a funnel at its apex, with a collariitted for the reception of the short transverse tube t, connecting with the tube r. The tire and smoke therefore enter the tube fr from the radiator ef at three points, o, p, and t, and issue into the smokepipe at u in the direction of the chimney.

The radiator c d, by means ofthe short connectingtubes both in the upper and under parts thereof, as described, has air-passages lv to increase the radiation. And the smaller central radiator g has also similar' air-passages for the like purpose.

These air-passages are not new, and l do not now claim them.

The upper part j' of the radiator e j', with the conductor r connected as described, is adjustable, and may be turned to the right or left at pleasure, so that, when the furnace is set in the desired position, the

exit funnel 4u maybe set for the smoke-pipe in the direction of the chimney or other issue for the smoke.'

This triple connection of the tube fr promotes the uniform and equable circulation of' heat and radiation.

There is a damper, y, operating in the. central tube t, in the usual manner. When this is closed, the circulation is thrown through the outside conductors o and p.

The annexed Figure 5 is a central vertical sect-ion of the complete furnace, designed to show the interior construction and circulation.

.I claim as new- 1. The construction of the upper and lower parts of the radiators complete in two parts to match together, vforming connecting-tubes without any addib tional connecting-pipe, as described.

2. The construction of the upper portion f of the radiator e f with two opposite outlets, o and p, into one common conductor, substantially as described.

3. The construction of the complex conductor lr, to receive the issues from Vopposite sides of the radiator', and also from the central radiator, as described, with 'the funnel u for connection with the smoke-pipe, all

in one piece, as described.

4. The construction of the conductor r, with its appendages and connections with the upper half of the radiator, so as to be adjustable in the manner described, and capable of presenting the outlet toward the chimney or other point of exit from any desired position of the furnace, as described.

THOMAS W. OHATFIELD. Vifitnesses HENRY OHATFIELD, LEANDER HARWOOD. 

